1593-1603 by Shakespeare 
Sonnet 138 

1	When my love swears that she is made of truth
2	I do believe her though I know she lies,
3	That she might think me some untutored youth
4	Unlearnèd in the world’s false subtleties.
5	Thus vainly thinking that she thinks me young,
6	Although she knows my days are past the best,
7	Simply I credit her false-speaking tongue#
8	On both sides thus is simple truth suppressed.
9	But wherefore says she not she is unjust,
10	And wherefore say not I that I am old?
11	O, love’s best habit is in seeming trust,
12	And age in love loves not to have years told.
13	Therefore I lie with her, and she with me,
14	And in our faults by lies we flattered be.